Lock with deadlocking latchbolt



March 29, 1966 M. M, QHECK 3,242,70

LOCK WITH DEADLOCKING LATCHBOLT Filed Nov. 27, 1963 2 Sheets-Sheet 1 arch 29, 1956 M. M. CHECK 3242,70@

LOCK WITH DEADLOCKING LATcHBoLT Filed Nov. 27, 1963 2 Sheets-Sheet 2 2O TLEEI.

INVENTOR. MATH/A6 M Cf/CK United States Patent 3,242,706 LOCK WITH DEADLCKING LATCHBGLT Mathias M. Check, Straord, Pa., assignor to Yale 8: Towne, Inc., New York, NPY., a corporation of Ohio Filed Nov. 27, 1963, Ser. No. 326,436 Claims. (Cl. 70-110) This invention relates to a novel mortise lock having a deadlocking latchbolt.

Those skilled in the art will appreciate that locks often have both a deadbolt and a latchbolt, with means that will allow full manual control of each bolt from both sides of the door. A latchbolt that will automatically be deadlocked is much to be desired, but in many cases there is very considerable difficulty -in designing `a lock with this type of latchbolt, as when the lock is a hotel lock, due to the fact that the deadlocking latchbolt must have automatic controls that will operate in proper relation to certain manual controls for both the latchbolt and deadbolt. The prior art contains many examples of deadlocking latchbolts, but insofar as I am aware, no one has been able to nd a fully satisfactory manner of constructing a mortise lock having the necessary controls for a deadlocking latchbolt and a deadbolt. Through my invention, I have conceived an extremely novel lock that has a deadlocking latchbolt together with a deadbolt, while contributing very well the functions that may be required of a particular type of lock.

My novel lock may have a deadbolt that is actuated in a usual way by a manually operated cam, such as a key plug cam or a thumbpiece cam, and a latchbolt that is retracted by a knob actuated retractor. Thus, the construction of my lock may be conventional to a certain extent. I particularly utilize in my invention a latch lever that always will move when the knob actuated retractor moves to retract the latchbolt. That lever also will be moved by the deadbolt actuating cam to retract the latchbolt. There is a trigger controlled dog for deadlocking the latchbolt, and I utilize the movements of the latch lever to apply further control so as to place the dog in release position whether the retraction of the latchbolt is effected through the cam or through the retractor. Thus, as a feature of my invention, I release a deadlocking dog through the movement of a lever that is operated both by a knob of the lock and by the cam that retracts the deadbolt.

I have thus outlined rather broadly the more important features of my invention in order that the detailed description thereof that follows may be better understood, and in order that my contribution to the art may be better appreciated. There are, of course, additional features of my invention that will be described hereinafter and which will form the subject of the claims appended hereto. Those skilled in the art will appreciate that the conception on which my disclosure is based may readily be utilized as a basis for the designing of other structures for carrying out the several purposes of my invention. It is important, therefore, that the claims be regarded as including such equivalent constructions as do not depart from the spirit and scope of my invention, in order to prevent the appropriation of my invention by those skilled in the art.

In the drawings,

FIG. l shows my novel lock with its cover removed to illustrate the lock parts;

FIG. 2 shows the position of the parts when the door has been closed and the deadbolt and latchbolt are in projected position;

FIG. 3 is like FIG. 2 but shows the deadbolt retracted; and

FIG. 4 further illustrates retraction of the latchbolt by the deadbolt operating cam.

ice

Referring now more particularly to FIG. 1 of the drawings, my novel lock includes a bevelled latchbolt 10, a deadbolt 11, and a bevelled trigger bolt 12, each mounted to slide between retracted and projected positions relatively to an opening in the front plate 13 on a lock case 14. As shown, I prefer to arrange deadbolt 11 and trigger bolt 12 above and below latchbolt 10. I believe it will suffice to describe briefly the details of the latchbolt 10 and deadbolt 11 because these bolts and their manual controls may utilize a construction that is quite usual in mortise locks. Thus, latchbolt 10 has a tail portion 15 that is mounted to slide on a guide 16 on lock case 14, and there is a coil spring 17 pressing latchbolt 10 toward projected position. The tail portion 15 has a flange 18 in opposed relation to a surface 19 on a latchbolt retractor 20 that fulcrums on a portion 21 of lock case 14. A bent spring 22 presses the latchbolt retractor 20 in a direction to coact with a rollback 23 that will be rotated by an inside knob spindle 24. Thereby the retractor 20 may be actuated by an inside knob, not shown, so as to retract the latchbolt 10. When the lock is a hotel lock, the retractor 20 can not be actuated by an outside knob, as will be appreciated.

The deadbolt 11 is a tail portion 25 that Iis mounted to slide on a guide pin 26. A key actuated lock cylinder 27 is mounted on the lock case 14 and has a rotating cam 2S that is adapted to act between opposed drive portions 29 and 30 on the tail portion 25 of deadbolt 11, whereby to move the deadbolt between retracted and projected positions. I show incidentally a rather conventional deadlocking tumbler 31 that is pivoted to deadbolt 11 and that normally will coact with a lug 32 on the lock case 14 so as to dog deadbolt 11 in projected and retracted positions. As will be understood, the rotating cam 28 will depress tumbler 31 so that the cam may move deadbolt 11. There may be a further cam (not shown) which will be rotated by an inside thumbpiece to project and retract deadbolt 11, but that cam will operate like the cam 28 and I shall merely refer to cam 28 in order to facilitate my description.

I shall now describe in detail the deadlocking controls for the latchbolt 10 in my novel lock. Still referring to FIG. l, the trigger bolt 12 has a tail portion 35 that slides in a guide 36 on lock case 14. A spring 37 acts against a surface 3S, shown by a dotted line -in FIG. l, whereby to press the trigger bolt 12 toward projected position. The trigger bolt 12 further has a flange 39 that is formed in a position extending upwardly inside the lock case 14.

Further, there is a deadlocking dog 40 and I prefer to make somewhat in the shape of an inverted L, and that I mount at its lower and rearward end to rotate about a pivot 41 on lock case 14. The opposed forward end of dog 40 is formed with a dogging surface 42, and a lug 43 that extends downwardly in front of the trigger bolt flange 39. A curved spring 44 is engaged between lock case 14 and deadlocking dog 4i? and presses the dog upwardly and rearwardly about its pivot toward the position shown in FIG. 2. That is the deadlocking position of dog 40, the dogging surface 42 then llying behind a portion 45 on latchbolt 10 so that the latchbolt can not be depressed to retracted position.

When trigger bolt 12 is projected by its spring 37, as in FIG. l, the flange 39 on that bolt will engage behind lug 43 and will rotate the deadlocldng dog 40 against its spring pressure to the release position shown in FIG. l. So long as trigger bolt 12 remains in projected position, the spring pressure of that bolt will be effective to hold dog 40 in release position. That naturally allows the latchbolt 10 to be pressed through Contact with the strike as the door lmoves toward closed position. When the door is fully closed, latchbolt 10 will project into an opening in strike S as shown in FIG. 2, and strike S will hold trigger bolt pivot.

3 Y 12 depressed so that the dog 40 normally will deadlock the latchbolt 10.

To describe further control that I apply to the deadlocking dog 40, I shall lirst indicate that I utilize a latch llever 50 well shown in FIG. l. The latch lever S6 is mounted through a pivot 51 on the tail portion 25 of deadbolt 11, so as to move bodily with deadbolt 11 as indicated in FIG. 2, and also to rotate relatively to the deadbolt as shown in FIG. 4. I form the latch lever 50 with an upper end portion having a drive surface 52, and a lower end portion S3 arranged in front of the latchbolt tail lange 18. The drive surface 52 is so arranged that it will be in position for engagement by the cam 28 when deadbolt 11 is in retracted position.

Thus, if we assume that cam 28 is rotated from the FIG. 1 or FIG. 3 position counterclockwise while deadbolt 11 is retracted, cam 28 will move against the drive surface 52 as shown in FIG. 4, depressing that surface so as to rotate latch lever 58 and causing the lower end 53 of latch lever 50 to retract latchbolt 10. Further, I form the knob actuated retractor 20 with a surface 54 that is arranged in front of the lower end 53 .of latch lever 5t). Thereby the retractor 2G when moving to retract latchbolt 10 also will rotate the latch lever 50. It wil-1 be understood, therefore, that latch lever 50 will rotate Whether the `latchbolt is retracted by knob loperation or by operation of the cam that moves the deadbolt.

I form a medial portion of the latch lever 50 with a side arm 55, and also with a slot 56 just below the side arm 55, as well shown in FIG. 1. For reasons that will appear, I form the slot 56 so as to have a considerable depth. I further utilize a control member 58 having an upper end portion S7 that is juxtaposed to the lower surface of the side arm 55 on latch lever Sil, and that may be accepted in the slot 56. Control member S8 is mounted to rotate about a pivot 59 on lock case 14, and has a lower end portion 60 that is adapted to coact with a surface 61 on the latchbolt deadlocking dog 40.

The operation of the control member 58 will be best understood if we now consider FIGS. 3 and 4 ofthe drawings. If we assume that the latch lever 50 starts to rotate from the FIG. 3 position, incidental to retraction of the latchbolt 10, the side arm 55 will act against the upper end 57 of control member 58 to rotate that member on its Thereby the control member 58 will move the deadlocking dog 40 to release position, as shown in FIG. 4, whereby to allow full retraction of the latchbolt 10. Since the latch lever 50 will rotate whether latchbolt 10 is retracted by knob or key operation, as I have already described, it will be seen that either type of operation will cause control member 58 to place deadlocking dog 4t) in release position. Of course, should the trigger bolt 12 already hold deadlocking dog 4G in release position, as in FIG. 1, the control member 5S need not move the dog 40 when latchbolt is retracted, and will merely rotate idly.

Referring again to FIG. 4, it will be seen that the operation of latch lever 50 and control member S8 has caused the slot S6 to engage the upper end portion 57 on member 5S. When the latchbolt 1! again is projected by its spring 17, the spring pressure will act through the tail ange 1S of latchbolt 10 to rotate latch lever 50 from the FIG. 4 position, causing slot 56 to move contnol member 53 toward normal position as shown in FIG. 3. That naturally enables the dog 40 to return by its spring pressure to deadlocking position, so that trigger bolt 12 again will control automatic deadlocking of the latchbolt 1i).

As I have previously mentioned in connection with FIG. 1, the depth of the slot 56 allows considerable clearance between the upper end S7 of control member 58 and the main portion of latch lever 50. That in elect allows lost motion between latch lever 50 and control member 5S when the lever 50 moves bodily with the deadbolt 11, as between the FIG. 2 and the FIG. 3 positions. Thus, while latch lever 5! may effectively control the deadlocking dog through control member 58, the movements of CFI holds triggerbolt 12 depressed so that deadlocking dog 40 deadlocks the latchbolt 1G. Should it be desired to project the deadbolt 11, the cam 28 (or a thumbpiece cam) will be rotated clockwise so as to move the deadbolt from the FIG. 1 to the FIG. 2 position. That movement of deadbolt 11 has caused latch lever 50 to move bodily, and incidentally to rotate somewhat, but control member 58 has not moved because the slot 56 has allowed the latch lever 50 to move with ilost motion relatively to the control lmember 5S. Naturally, the dog 40 remains in position deadlocking the latchbolt 10.

If We nofw assume that the door is to be opened, the cam 28 tirst will be rotated in a counterclockwise direction to move deadbolt 11 to the retracted position shown in FIG. 3. Again, the lost motion between latch lever 56 and control member 58 has allowed the lever 50 to move bodily without aiec'ting the position of memlber 58 or deadlocking dog 40, and latchibolt 10 remains deadlocked. The drive surface 52 on latch lever 50 now is in position to be eng-aged by a further counterclockwise rotation of cam 28, -as indicated in FIG. 4, which Will depress the surface 52 so fas to rotate latch lever 50. That rotation of lever S0 will move the control member l58 so as to place the deadlocking dog 40 in release position, and further will cause the end portion 53 on the lever 50 to retract the latchlbolt 10, all as shown in FIG. 4.

Let us now consider that the deadbolt 11 has been retracted, as in FIG. 3, but that knob operation is to be utilized to retract latchbolt 10. Thus, rotation of the knob spindle 24 will move latchrbol't retractor 20, which now will act through surface 54 to rotate latch lever 50. That lever again Will act through control member 58 to place the deadlocking dog 40 in release (position ,so that retracto-r 20 may elect full retraction of latchlbolt 10.

When the retracting flange 18 on latch bolt 10 is relieved of retract-ing pressure, whether the retraction has :been through the knob actu-ate dretractor 20 or through the latch lever 50, the spring pressure of latchbolt 10 will project the latohlbolt, -as in FIG. l or FIG. 3, while also acting through flange 18 to rotate latch lever 50. The slot 56 on lever 50 thereby will move the control member S8 toward norm-al position, allowing the trigger bolt 12 again to control the deladlocking dog 40 for automatically deadlockin-g the latchbolt 10.

I believe it will now be understood that the deadlockling dog 40 of my novel lock will be so controlled as to allow retract-ion of latchbolt 10 by either key or knob operation, while contributing the ynecessary deadloeking control through the triggerbolt 12. Moreover, the deadlocking control will not be affected when the key operation is utilized to project and retnact the deadbolt y1,1. The novel concept of my invention actually enables me to construct a lock that will contribute exceedingly eiective deadlocking of a latchbolt, while also achieving the deadbolt operation that may be required in a particular `type of lock. I believe, therefore, that the very considerable value of my novel lock will be undesrtoood, and that the merits of my invention will be fully appreciated by those skilled in the art.

I noul claim:

1. In a mortise lock of the class described, a spring projected latchbolt, a latchbolt deadlocking dog, a knob actuated retractor for retracting the latchbolt, a deadbolt, `a cam for projecting and retracting the deadbolt, a latch lever pivoted on the deadbolt, said latch lever being rotatable on its pivot to retract the latclrbolt when the deadbolt is in retracted position, means whereby the knob actuated retractor rotates the latch lever on the dead'oolt, means whereby said latch lever moves the deadlocking dog out of latchbolt deadlock-ing position as said lever rotates incidental to retraction of the latchbolt, and means through which said deadbolt operating cam coacts with the latch lever for rotating said latch lever on the deadbolt when the deadbolt is in retracted position, so that said cam will be effective for moving said dog from deadlocking position and retracting the latchbolt.

2. -In a mortise lock of the class described, a spring projected latchbolt, a latchbolt deadlocking dog, a trigger bolt automatically controlling said dog for deadlocking the latchbolt when the door closes, a knob actuated retractor for retracting the latchbolt, a deadbolt, Ia cam for projecting and retracting the de-'adbo'l-t, said deadbol-t being equipped with means actuated by said cam for locking said deadbolt in a projected position, a latch lever pivoted on the deadbol-t and rotatable on its pivot to retract the latchbolt when the deadbolt is in retracted position, means through which said latch lever when so rotating acts -for moving said dog out off latchbolt deadlocking position, and means through which both the knob actuated retractor and said deadbolt projecting and retracting cam rotate said lever for moving said dog from deadlocking position independently of the trigyger bolt while retracting the latchbolt.

3. In a mortise lock of the class described, a spring projected latchbolt, a latchbolt deadlocking dog, a knob actuated retractor for reti-acting the latchbolt, a deadbolt, a cam for projecting and retracting the deadbolt, a latch lever pivoted to the deadbolt and moving bodily with said deadbolt, said latch lever being rotatable on the deadbolt to retract the latchbolt, means whereby the knob actuated retractor rotates the latch lever, means lthrough which said latch lever acts for moving the deadlocking dog out of latchbolt deadlocking position as said leve-r rotates incidental to retraction of the l-atchbolt, a lost-motion connection between said dog and latch lever whereby the bodily movement of said lever with the deadbol't does not move the deadlocking dog, and means whereby said deadbolt operating cam is eiective for rotating the latch lever when the deadbolt is in retracted position, so that said cam may move the dog from deadlocking position and retract the latchbolt.

4. In a mortise lock of the class described, a spring projected latchbolt, a latchbolt deadlocking dog, a trigger bolt Iautomatically controlling s-aid dog for deadlocking the latchbolt when the door close-s, a knob actuated retractor for retracting the latchbolt, a deadbolt, a cam for projecting and retracting the deadbol-t, a latch lever Ipivoted to the deadbolt and moving bodily wit-h said deadbolt, said lever being rotatable on the deadbolt to retract the latchbolt, means whereby the knob actuated retractor rotates the latch le-ver, a control member through which said latch lever acts for moving the deadlocking dog out of latchbolt deadlocking position independently ot the trigger bolt as said level rotates incidental to retraction of the latchbolt, means whereby said deadlbolt operating cam is effective for rotating the latch lever when the deadfbolt is in retracted position, so that said cam may move the dog from deadlooking position and retract the latchbolt, and a lost-motion connection between said latch lever and control member so that said cam when projecting and retracting the deadbolt does not move the deadlocking dog.

5. In a mortise lock of the class described, a spring projected latchbolt, a dog for deadlock-ing said latchbolt, a trigger bolt for controlling said dog, a deadbolt, a cam -for moving said deadbolt between retracted and projected positions, said deadbol-t being equipped with means actuated by said cam :tor locking said deadbolt in a projected position, a latch lever pivoted on the deadbolt and rotatable on its 4pivot by said cam for retracting the latchbolt, a knob actuated retractor, means whereby the kno-b actuated retractor retract-s the latchbolt while also rotating said latch lever, and means through which the latch lever acts for moving the deadlocking dog to a -release position when the latch lever is rotated by the knob actuated retractor or the cam wh-ile the deadbolt is in retracted position.

References Cited by the Examiner UNITED STATES PATENTS 1,126,560 1/1915 Page 70-151 1,188,805 5/1916 Mason 70-151 1,508,668 9/1924 Pringler 70-151 1,961,483 6/1934 Goldberg 70-110 2,303 ,-624 12/ 1942 Edwards et al. 70-110 2,638,770 5/19'53 Gutman 70-107 3,129,579 4/ 1964 Bellantuono 70-110 FOREIGN PATENTS 63,812 8/1941 Norway.

JOSEPH D. SEERS, Primary Examiner.

BOBBY R. GAY, ALBERT H. KAMPE, Examiners. 

5. IN A MORTISE LOCK OF THE CLASS DESCRIBED, A SPRING PROJECTED LATCHBOLT, A DOG FOR DEADLOCKING SAID LATCHBOLT, A TRIGGER BOLT FOR CONTROLLING SAID DOG, A DEADBOLT, A CAM FOR MOVING SAID DEADBOLT BETWEEN RETRACTED AND PROJECTED POSITIONS, SAID DEADBOLT BEING EQUIPPED WITH MEANS ACTUATED BY SAID CAM FOR LOCKING SAID DEADBOLT IN A PROJECTED POSITION, A LATCH LEVER PIVOTED ON THE DEADBOLT AND ROTATABLE ON ITS PIVOT BY SAID CAM FOR RETRACTING THE LATCHBOLT, A KNOB ACTUATED RETRACTOR, MEANS WHEREBY THE KNOB ACTUATED RETRACTOR RETRACTS THE LATCHBOLT WHILE ALSO ROTATING SAID LATCH LEVER, AND MEANS THROUGH WHICH THE LATCH LEVER ACTS FOR MOVING THE DEADLOCKING DOG TO TO RELEASE POSITION WHEN THE LATCH LEVER IS ROTATED BY THE KNOB ACTUATED RETRACTOR OR THE CAM WHILE THE DEADBOLT IS IN RETRACTED POSITION. 